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    Code in Python 3 n = int(input()) breads = list(map(int, input().split()))

    minimum = 0 if breads[0]%2 == 1: minimum+=2 breads[0]+=1 breads[1]+=1 for index in range(1 ,n-1): if breads[index] %2 == 0: continue breads[index]+=1 breads[index+1]+=1 minimum+=2

    if breads[n-1] %2 == 0: print(minimum) else: print('NO')